linux/drivers/misc/enclosure.c
Yinghai Lu 5e43754fd9 [SCSI] ses: fix problems caused by empty SES provided name
We use the name provided by SES to name objects.  An empty name is
legal in SES but causes problems in our generic device hierarchy.  Fix
this by falling back to a number if the name is either NULL or empty.

Also fix a secondary bug spotted in that dev_set_name(dev, name) uses
a string format and so would go wrong if name contained a '%'.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
2009-05-15 12:20:57 -04:00

536 lines
14 KiB
C

/*
* Enclosure Services
*
* Copyright (C) 2008 James Bottomley <James.Bottomley@HansenPartnership.com>
*
**-----------------------------------------------------------------------------
**
** This program is free software; you can redistribute it and/or
** modify it under the terms of the GNU General Public License
** version 2 as published by the Free Software Foundation.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
**
**-----------------------------------------------------------------------------
*/
#include <linux/device.h>
#include <linux/enclosure.h>
#include <linux/err.h>
#include <linux/list.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mutex.h>
static LIST_HEAD(container_list);
static DEFINE_MUTEX(container_list_lock);
static struct class enclosure_class;
/**
* enclosure_find - find an enclosure given a device
* @dev: the device to find for
*
* Looks through the list of registered enclosures to see
* if it can find a match for a device. Returns NULL if no
* enclosure is found. Obtains a reference to the enclosure class
* device which must be released with device_put().
*/
struct enclosure_device *enclosure_find(struct device *dev)
{
struct enclosure_device *edev;
mutex_lock(&container_list_lock);
list_for_each_entry(edev, &container_list, node) {
if (edev->edev.parent == dev) {
get_device(&edev->edev);
mutex_unlock(&container_list_lock);
return edev;
}
}
mutex_unlock(&container_list_lock);
return NULL;
}
EXPORT_SYMBOL_GPL(enclosure_find);
/**
* enclosure_for_each_device - calls a function for each enclosure
* @fn: the function to call
* @data: the data to pass to each call
*
* Loops over all the enclosures calling the function.
*
* Note, this function uses a mutex which will be held across calls to
* @fn, so it must have non atomic context, and @fn may (although it
* should not) sleep or otherwise cause the mutex to be held for
* indefinite periods
*/
int enclosure_for_each_device(int (*fn)(struct enclosure_device *, void *),
void *data)
{
int error = 0;
struct enclosure_device *edev;
mutex_lock(&container_list_lock);
list_for_each_entry(edev, &container_list, node) {
error = fn(edev, data);
if (error)
break;
}
mutex_unlock(&container_list_lock);
return error;
}
EXPORT_SYMBOL_GPL(enclosure_for_each_device);
/**
* enclosure_register - register device as an enclosure
*
* @dev: device containing the enclosure
* @components: number of components in the enclosure
*
* This sets up the device for being an enclosure. Note that @dev does
* not have to be a dedicated enclosure device. It may be some other type
* of device that additionally responds to enclosure services
*/
struct enclosure_device *
enclosure_register(struct device *dev, const char *name, int components,
struct enclosure_component_callbacks *cb)
{
struct enclosure_device *edev =
kzalloc(sizeof(struct enclosure_device) +
sizeof(struct enclosure_component)*components,
GFP_KERNEL);
int err, i;
BUG_ON(!cb);
if (!edev)
return ERR_PTR(-ENOMEM);
edev->components = components;
edev->edev.class = &enclosure_class;
edev->edev.parent = get_device(dev);
edev->cb = cb;
dev_set_name(&edev->edev, "%s", name);
err = device_register(&edev->edev);
if (err)
goto err;
for (i = 0; i < components; i++)
edev->component[i].number = -1;
mutex_lock(&container_list_lock);
list_add_tail(&edev->node, &container_list);
mutex_unlock(&container_list_lock);
return edev;
err:
put_device(edev->edev.parent);
kfree(edev);
return ERR_PTR(err);
}
EXPORT_SYMBOL_GPL(enclosure_register);
static struct enclosure_component_callbacks enclosure_null_callbacks;
/**
* enclosure_unregister - remove an enclosure
*
* @edev: the registered enclosure to remove;
*/
void enclosure_unregister(struct enclosure_device *edev)
{
int i;
mutex_lock(&container_list_lock);
list_del(&edev->node);
mutex_unlock(&container_list_lock);
for (i = 0; i < edev->components; i++)
if (edev->component[i].number != -1)
device_unregister(&edev->component[i].cdev);
/* prevent any callbacks into service user */
edev->cb = &enclosure_null_callbacks;
device_unregister(&edev->edev);
}
EXPORT_SYMBOL_GPL(enclosure_unregister);
#define ENCLOSURE_NAME_SIZE 64
static void enclosure_link_name(struct enclosure_component *cdev, char *name)
{
strcpy(name, "enclosure_device:");
strcat(name, dev_name(&cdev->cdev));
}
static void enclosure_remove_links(struct enclosure_component *cdev)
{
char name[ENCLOSURE_NAME_SIZE];
enclosure_link_name(cdev, name);
sysfs_remove_link(&cdev->dev->kobj, name);
sysfs_remove_link(&cdev->cdev.kobj, "device");
}
static int enclosure_add_links(struct enclosure_component *cdev)
{
int error;
char name[ENCLOSURE_NAME_SIZE];
error = sysfs_create_link(&cdev->cdev.kobj, &cdev->dev->kobj, "device");
if (error)
return error;
enclosure_link_name(cdev, name);
error = sysfs_create_link(&cdev->dev->kobj, &cdev->cdev.kobj, name);
if (error)
sysfs_remove_link(&cdev->cdev.kobj, "device");
return error;
}
static void enclosure_release(struct device *cdev)
{
struct enclosure_device *edev = to_enclosure_device(cdev);
put_device(cdev->parent);
kfree(edev);
}
static void enclosure_component_release(struct device *dev)
{
struct enclosure_component *cdev = to_enclosure_component(dev);
if (cdev->dev) {
enclosure_remove_links(cdev);
put_device(cdev->dev);
}
put_device(dev->parent);
}
static struct attribute_group *enclosure_groups[];
/**
* enclosure_component_register - add a particular component to an enclosure
* @edev: the enclosure to add the component
* @num: the device number
* @type: the type of component being added
* @name: an optional name to appear in sysfs (leave NULL if none)
*
* Registers the component. The name is optional for enclosures that
* give their components a unique name. If not, leave the field NULL
* and a name will be assigned.
*
* Returns a pointer to the enclosure component or an error.
*/
struct enclosure_component *
enclosure_component_register(struct enclosure_device *edev,
unsigned int number,
enum enclosure_component_type type,
const char *name)
{
struct enclosure_component *ecomp;
struct device *cdev;
int err;
if (number >= edev->components)
return ERR_PTR(-EINVAL);
ecomp = &edev->component[number];
if (ecomp->number != -1)
return ERR_PTR(-EINVAL);
ecomp->type = type;
ecomp->number = number;
cdev = &ecomp->cdev;
cdev->parent = get_device(&edev->edev);
if (name && name[0])
dev_set_name(cdev, "%s", name);
else
dev_set_name(cdev, "%u", number);
cdev->release = enclosure_component_release;
cdev->groups = enclosure_groups;
err = device_register(cdev);
if (err)
ERR_PTR(err);
return ecomp;
}
EXPORT_SYMBOL_GPL(enclosure_component_register);
/**
* enclosure_add_device - add a device as being part of an enclosure
* @edev: the enclosure device being added to.
* @num: the number of the component
* @dev: the device being added
*
* Declares a real device to reside in slot (or identifier) @num of an
* enclosure. This will cause the relevant sysfs links to appear.
* This function may also be used to change a device associated with
* an enclosure without having to call enclosure_remove_device() in
* between.
*
* Returns zero on success or an error.
*/
int enclosure_add_device(struct enclosure_device *edev, int component,
struct device *dev)
{
struct enclosure_component *cdev;
if (!edev || component >= edev->components)
return -EINVAL;
cdev = &edev->component[component];
if (cdev->dev)
enclosure_remove_links(cdev);
put_device(cdev->dev);
cdev->dev = get_device(dev);
return enclosure_add_links(cdev);
}
EXPORT_SYMBOL_GPL(enclosure_add_device);
/**
* enclosure_remove_device - remove a device from an enclosure
* @edev: the enclosure device
* @num: the number of the component to remove
*
* Returns zero on success or an error.
*
*/
int enclosure_remove_device(struct enclosure_device *edev, int component)
{
struct enclosure_component *cdev;
if (!edev || component >= edev->components)
return -EINVAL;
cdev = &edev->component[component];
device_del(&cdev->cdev);
put_device(cdev->dev);
cdev->dev = NULL;
return device_add(&cdev->cdev);
}
EXPORT_SYMBOL_GPL(enclosure_remove_device);
/*
* sysfs pieces below
*/
static ssize_t enclosure_show_components(struct device *cdev,
struct device_attribute *attr,
char *buf)
{
struct enclosure_device *edev = to_enclosure_device(cdev);
return snprintf(buf, 40, "%d\n", edev->components);
}
static struct device_attribute enclosure_attrs[] = {
__ATTR(components, S_IRUGO, enclosure_show_components, NULL),
__ATTR_NULL
};
static struct class enclosure_class = {
.name = "enclosure",
.owner = THIS_MODULE,
.dev_release = enclosure_release,
.dev_attrs = enclosure_attrs,
};
static const char *const enclosure_status [] = {
[ENCLOSURE_STATUS_UNSUPPORTED] = "unsupported",
[ENCLOSURE_STATUS_OK] = "OK",
[ENCLOSURE_STATUS_CRITICAL] = "critical",
[ENCLOSURE_STATUS_NON_CRITICAL] = "non-critical",
[ENCLOSURE_STATUS_UNRECOVERABLE] = "unrecoverable",
[ENCLOSURE_STATUS_NOT_INSTALLED] = "not installed",
[ENCLOSURE_STATUS_UNKNOWN] = "unknown",
[ENCLOSURE_STATUS_UNAVAILABLE] = "unavailable",
};
static const char *const enclosure_type [] = {
[ENCLOSURE_COMPONENT_DEVICE] = "device",
[ENCLOSURE_COMPONENT_ARRAY_DEVICE] = "array device",
};
static ssize_t get_component_fault(struct device *cdev,
struct device_attribute *attr, char *buf)
{
struct enclosure_device *edev = to_enclosure_device(cdev->parent);
struct enclosure_component *ecomp = to_enclosure_component(cdev);
if (edev->cb->get_fault)
edev->cb->get_fault(edev, ecomp);
return snprintf(buf, 40, "%d\n", ecomp->fault);
}
static ssize_t set_component_fault(struct device *cdev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct enclosure_device *edev = to_enclosure_device(cdev->parent);
struct enclosure_component *ecomp = to_enclosure_component(cdev);
int val = simple_strtoul(buf, NULL, 0);
if (edev->cb->set_fault)
edev->cb->set_fault(edev, ecomp, val);
return count;
}
static ssize_t get_component_status(struct device *cdev,
struct device_attribute *attr,char *buf)
{
struct enclosure_device *edev = to_enclosure_device(cdev->parent);
struct enclosure_component *ecomp = to_enclosure_component(cdev);
if (edev->cb->get_status)
edev->cb->get_status(edev, ecomp);
return snprintf(buf, 40, "%s\n", enclosure_status[ecomp->status]);
}
static ssize_t set_component_status(struct device *cdev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct enclosure_device *edev = to_enclosure_device(cdev->parent);
struct enclosure_component *ecomp = to_enclosure_component(cdev);
int i;
for (i = 0; enclosure_status[i]; i++) {
if (strncmp(buf, enclosure_status[i],
strlen(enclosure_status[i])) == 0 &&
(buf[strlen(enclosure_status[i])] == '\n' ||
buf[strlen(enclosure_status[i])] == '\0'))
break;
}
if (enclosure_status[i] && edev->cb->set_status) {
edev->cb->set_status(edev, ecomp, i);
return count;
} else
return -EINVAL;
}
static ssize_t get_component_active(struct device *cdev,
struct device_attribute *attr, char *buf)
{
struct enclosure_device *edev = to_enclosure_device(cdev->parent);
struct enclosure_component *ecomp = to_enclosure_component(cdev);
if (edev->cb->get_active)
edev->cb->get_active(edev, ecomp);
return snprintf(buf, 40, "%d\n", ecomp->active);
}
static ssize_t set_component_active(struct device *cdev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct enclosure_device *edev = to_enclosure_device(cdev->parent);
struct enclosure_component *ecomp = to_enclosure_component(cdev);
int val = simple_strtoul(buf, NULL, 0);
if (edev->cb->set_active)
edev->cb->set_active(edev, ecomp, val);
return count;
}
static ssize_t get_component_locate(struct device *cdev,
struct device_attribute *attr, char *buf)
{
struct enclosure_device *edev = to_enclosure_device(cdev->parent);
struct enclosure_component *ecomp = to_enclosure_component(cdev);
if (edev->cb->get_locate)
edev->cb->get_locate(edev, ecomp);
return snprintf(buf, 40, "%d\n", ecomp->locate);
}
static ssize_t set_component_locate(struct device *cdev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct enclosure_device *edev = to_enclosure_device(cdev->parent);
struct enclosure_component *ecomp = to_enclosure_component(cdev);
int val = simple_strtoul(buf, NULL, 0);
if (edev->cb->set_locate)
edev->cb->set_locate(edev, ecomp, val);
return count;
}
static ssize_t get_component_type(struct device *cdev,
struct device_attribute *attr, char *buf)
{
struct enclosure_component *ecomp = to_enclosure_component(cdev);
return snprintf(buf, 40, "%s\n", enclosure_type[ecomp->type]);
}
static DEVICE_ATTR(fault, S_IRUGO | S_IWUSR, get_component_fault,
set_component_fault);
static DEVICE_ATTR(status, S_IRUGO | S_IWUSR, get_component_status,
set_component_status);
static DEVICE_ATTR(active, S_IRUGO | S_IWUSR, get_component_active,
set_component_active);
static DEVICE_ATTR(locate, S_IRUGO | S_IWUSR, get_component_locate,
set_component_locate);
static DEVICE_ATTR(type, S_IRUGO, get_component_type, NULL);
static struct attribute *enclosure_component_attrs[] = {
&dev_attr_fault.attr,
&dev_attr_status.attr,
&dev_attr_active.attr,
&dev_attr_locate.attr,
&dev_attr_type.attr,
NULL
};
static struct attribute_group enclosure_group = {
.attrs = enclosure_component_attrs,
};
static struct attribute_group *enclosure_groups[] = {
&enclosure_group,
NULL
};
static int __init enclosure_init(void)
{
int err;
err = class_register(&enclosure_class);
if (err)
return err;
return 0;
}
static void __exit enclosure_exit(void)
{
class_unregister(&enclosure_class);
}
module_init(enclosure_init);
module_exit(enclosure_exit);
MODULE_AUTHOR("James Bottomley");
MODULE_DESCRIPTION("Enclosure Services");
MODULE_LICENSE("GPL v2");